Sūtra 7·1·70
उगिदचां सर्वनामस्थाने ऽधातोः
ugidacāṃ sarvanāmasthāne 'dhātoḥ
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Whatever has an indicatory u, ṛ and ḷ, (with the exception of a root), and the stem ac, (añcati) get the augment num in the strong cases.
Padapāṭha ukitacām sarvanāmasthāne adhātoḥउकितचाम् सर्वनामस्थाने अधातोः